It's All in Your Head: True Stories of Imaginary Illness

excerpt

Blushing occurs when the blood vessels of the head and neck dilate and become infused with blood. It is an instantaneous physical change seen on the surface but reflecting a feeling of embarrassment or happiness that is held inside. When it happens I can’t control it. That point is important. My blushes betray a feeling and, even when they increase my embarrassment, I cannot stop them.